Hi!
As mentioned in the PR and discussed on IRC, the following patch is the
patch that fixes the originally reported issue.
We have there because of the premature bitfield comparison -> BIT_FIELD_REF
optimization:
s$s4_19 = 0;
s.s4 = s$s4_19;
_10 = BIT_FIELD_REF <s, 8, 0>;
_13 = _10 & 8;
and no other s fields are initialized. If they would be all initialized with
constants, then my earlier PR93582 bitfield handling patches would handle it
already, but if at least one bit we ignore after the BIT_AND_EXPR masking
is not initialized or is initialized earlier to non-constant, we aren't able
to look through it until combine, which is too late for the warnings on the
dead code.
This patch handles BIT_AND_EXPR where the first operand is a SSA_NAME
initialized with a memory load and second operand is INTEGER_CST, by trying
a partial def lookup after pushing the ranges of 0 bits in the mask as
artificial initializers. In the above case on little-endian, we push
offset 0 size 3 {} partial def and offset 4 size 4 (the result is unsigned
char) and then perform normal partial def handling.
My initial version of the patch failed miserably during bootstrap, because
data->finish (...) called vn_reference_lookup_or_insert_for_pieces
which I believe tried to remember the masked value rather than real for the
reference, or for failed lookup visit_reference_op_load called
vn_reference_insert. The following version makes sure we aren't calling
either of those functions in the masked case, as we don't know anything
better about the reference from whatever has been discovered when the load
stmt has been visited, the patch just calls vn_nary_op_insert_stmt on
failure with the lhs (apparently calling it with the INTEGER_CST doesn't
work).
Bootstrapped/regtested on powerpc64{,le}-linux, I've additionally
gathered statistics of successful BIT_AND_EXPR optimizations (attached, first
column is uniq -c count, second BITS_PER_WORD, then filename, function name,
the mask on BIT_AND_EXPR and finally the value it returned).
Ok for trunk if it also passes bootstrap/regtest on x86_64-linux and
i686-linux?
2020-02-28 Jakub Jelinek <ja...@redhat.com>
PR tree-optimization/93582
* tree-ssa-sccvn.h (vn_reference_lookup): Add mask argument.
* tree-ssa-sccvn.c (struct vn_walk_cb_data): Add masked_p member,
initialize it in the constructor.
(vn_walk_cb_data::finish): If masked_p is true, return val instead
of calling vn_reference_lookup_or_insert_for_pieces. Formatting fix.
(vn_reference_lookup_pieces): Adjust vn_walk_cb_data initialization.
Formatting fix.
(vn_reference_lookup): Add mask argument. If non-NULL, don't call
fully_constant_vn_reference_p nor vn_reference_lookup_1 and
artificially push partial {} defs for the portions of the mask that
contains zeros.
(visit_nary_op): Handle BIT_AND_EXPR of a memory load and INTEGER_CST
mask.
(visit_reference_op_load): Add mask argument, pass it through
to vn_reference_lookup. If non-NULL, don't call vn_reference_insert.
(visit_stmt): Adjust visit_reference_op_load caller. Formatting fix.
* gcc.dg/tree-ssa/pr93582-10.c: New test.
* gcc.dg/pr93582.c: New test.
* gcc.c-torture/execute/pr93582.c: New test.
--- gcc/tree-ssa-sccvn.h.jj 2020-02-28 11:56:39.506941888 +0100
+++ gcc/tree-ssa-sccvn.h 2020-02-28 12:01:42.677404902 +0100
@@ -256,7 +256,7 @@ tree vn_reference_lookup_pieces (tree, a
vec<vn_reference_op_s> ,
vn_reference_t *, vn_lookup_kind);
tree vn_reference_lookup (tree, tree, vn_lookup_kind, vn_reference_t *, bool,
- tree * = NULL);
+ tree * = NULL, tree = NULL_TREE);
void vn_reference_lookup_call (gcall *, vn_reference_t *, vn_reference_t);
vn_reference_t vn_reference_insert_pieces (tree, alias_set_type, tree,
vec<vn_reference_op_s> ,
--- gcc/tree-ssa-sccvn.c.jj 2020-02-28 11:56:39.506941888 +0100
+++ gcc/tree-ssa-sccvn.c 2020-02-28 12:53:58.500459041 +0100
@@ -1686,9 +1686,9 @@ struct pd_data
struct vn_walk_cb_data
{
vn_walk_cb_data (vn_reference_t vr_, tree orig_ref_, tree *last_vuse_ptr_,
- vn_lookup_kind vn_walk_kind_, bool tbaa_p_)
+ vn_lookup_kind vn_walk_kind_, bool tbaa_p_, bool masked_p_)
: vr (vr_), last_vuse_ptr (last_vuse_ptr_), last_vuse (NULL_TREE),
- vn_walk_kind (vn_walk_kind_), tbaa_p (tbaa_p_),
+ vn_walk_kind (vn_walk_kind_), tbaa_p (tbaa_p_), masked_p (masked_p_),
saved_operands (vNULL), first_set (-2), known_ranges (NULL)
{
if (!last_vuse_ptr)
@@ -1705,6 +1705,7 @@ struct vn_walk_cb_data
tree last_vuse;
vn_lookup_kind vn_walk_kind;
bool tbaa_p;
+ bool masked_p;
vec<vn_reference_op_s> saved_operands;
/* The VDEFs of partial defs we come along. */
@@ -1731,9 +1732,12 @@ vn_walk_cb_data::finish (alias_set_type
{
if (first_set != -2)
set = first_set;
- return vn_reference_lookup_or_insert_for_pieces
- (last_vuse, set, vr->type,
- saved_operands.exists () ? saved_operands : vr->operands, val);
+ if (masked_p)
+ return (void *) val;
+ vec<vn_reference_op_s> &operands
+ = saved_operands.exists () ? saved_operands : vr->operands;
+ return vn_reference_lookup_or_insert_for_pieces (last_vuse, set, vr->type,
+ operands, val);
}
/* pd_range splay-tree helpers. */
@@ -3380,13 +3384,13 @@ vn_reference_lookup_pieces (tree vuse, a
{
ao_ref r;
unsigned limit = param_sccvn_max_alias_queries_per_access;
- vn_walk_cb_data data (&vr1, NULL_TREE, NULL, kind, true);
+ vn_walk_cb_data data (&vr1, NULL_TREE, NULL, kind, true, false);
if (ao_ref_init_from_vn_reference (&r, set, type, vr1.operands))
- *vnresult =
- (vn_reference_t)walk_non_aliased_vuses (&r, vr1.vuse, true,
- vn_reference_lookup_2,
- vn_reference_lookup_3,
- vuse_valueize, limit, &data);
+ *vnresult
+ = ((vn_reference_t)
+ walk_non_aliased_vuses (&r, vr1.vuse, true, vn_reference_lookup_2,
+ vn_reference_lookup_3, vuse_valueize,
+ limit, &data));
gcc_checking_assert (vr1.operands == shared_lookup_references);
}
@@ -3402,15 +3406,19 @@ vn_reference_lookup_pieces (tree vuse, a
was NULL.. VNRESULT will be filled in with the vn_reference_t
stored in the hashtable if one exists. When TBAA_P is false assume
we are looking up a store and treat it as having alias-set zero.
- *LAST_VUSE_PTR will be updated with the VUSE the value lookup succeeded. */
+ *LAST_VUSE_PTR will be updated with the VUSE the value lookup succeeded.
+ MASK is either NULL_TREE, or can be an INTEGER_CST if the result of the
+ load is bitwise anded with MASK and so we are only interested in a subset
+ of the bits and can ignore if the other bits are uninitialized or
+ not initialized with constants. */
tree
vn_reference_lookup (tree op, tree vuse, vn_lookup_kind kind,
- vn_reference_t *vnresult, bool tbaa_p, tree *last_vuse_ptr)
+ vn_reference_t *vnresult, bool tbaa_p,
+ tree *last_vuse_ptr, tree mask)
{
vec<vn_reference_op_s> operands;
struct vn_reference_s vr1;
- tree cst;
bool valuezied_anything;
if (vnresult)
@@ -3422,11 +3430,11 @@ vn_reference_lookup (tree op, tree vuse,
vr1.type = TREE_TYPE (op);
vr1.set = get_alias_set (op);
vr1.hashcode = vn_reference_compute_hash (&vr1);
- if ((cst = fully_constant_vn_reference_p (&vr1)))
- return cst;
+ if (mask == NULL_TREE)
+ if (tree cst = fully_constant_vn_reference_p (&vr1))
+ return cst;
- if (kind != VN_NOWALK
- && vr1.vuse)
+ if (kind != VN_NOWALK && vr1.vuse)
{
vn_reference_t wvnresult;
ao_ref r;
@@ -3438,12 +3446,63 @@ vn_reference_lookup (tree op, tree vuse,
vr1.operands))
ao_ref_init (&r, op);
vn_walk_cb_data data (&vr1, r.ref ? NULL_TREE : op,
- last_vuse_ptr, kind, tbaa_p);
- wvnresult =
- (vn_reference_t)walk_non_aliased_vuses (&r, vr1.vuse, tbaa_p,
- vn_reference_lookup_2,
- vn_reference_lookup_3,
- vuse_valueize, limit, &data);
+ last_vuse_ptr, kind, tbaa_p, mask != NULL_TREE);
+ if (mask)
+ {
+ wide_int w = wi::to_wide (mask);
+ unsigned int pos = 0, prec = w.get_precision ();
+ pd_data pd;
+ pd.rhs = build_constructor (NULL_TREE, NULL);
+ /* When bitwise and with a constant is done on a memory load,
+ we don't really need all the bits to be defined or defined
+ to constants, we don't really care what is in the position
+ corresponding to 0 bits in the mask.
+ So, push the ranges of those 0 bits in the mask as artificial
+ zero stores and let the partial def handling code do the
+ rest. */
+ while (pos < prec)
+ {
+ int tz = wi::ctz (w);
+ if (pos + tz > prec)
+ tz = prec - pos;
+ if (tz)
+ {
+ if (BYTES_BIG_ENDIAN)
+ pd.offset = prec - pos - tz;
+ else
+ pd.offset = pos;
+ pd.size = tz;
+ void *r = data.push_partial_def (pd, 0, prec);
+ if (r == (void *) -1)
+ return NULL_TREE;
+ gcc_assert (r == NULL_TREE);
+ }
+ pos += tz;
+ if (pos == prec)
+ break;
+ w = wi::lrshift (w, tz);
+ tz = wi::ctz (wi::bit_not (w));
+ if (pos + tz > prec)
+ tz = prec - pos;
+ pos += tz;
+ w = wi::lrshift (w, tz);
+ }
+
+ gcc_assert (vnresult == NULL);
+ tree res
+ = ((tree)
+ walk_non_aliased_vuses (&r, vr1.vuse, tbaa_p,
+ vn_reference_lookup_2,
+ vn_reference_lookup_3, vuse_valueize,
+ limit, &data));
+ return res;
+ }
+
+ wvnresult
+ = ((vn_reference_t)
+ walk_non_aliased_vuses (&r, vr1.vuse, tbaa_p, vn_reference_lookup_2,
+ vn_reference_lookup_3, vuse_valueize, limit,
+ &data));
gcc_checking_assert (vr1.operands == shared_lookup_references);
if (wvnresult)
{
@@ -3457,6 +3516,8 @@ vn_reference_lookup (tree op, tree vuse,
if (last_vuse_ptr)
*last_vuse_ptr = vr1.vuse;
+ if (mask)
+ return NULL_TREE;
return vn_reference_lookup_1 (&vr1, vnresult);
}
@@ -4565,6 +4626,8 @@ valueized_wider_op (tree wide_type, tree
return NULL_TREE;
}
+static bool visit_reference_op_load (tree, tree, gimple *, tree);
+
/* Visit a nary operator RHS, value number it, and return true if the
value number of LHS has changed as a result. */
@@ -4664,7 +4727,35 @@ visit_nary_op (tree lhs, gassign *stmt)
}
}
}
- default:;
+ break;
+ case BIT_AND_EXPR:
+ if (INTEGRAL_TYPE_P (type)
+ && TREE_CODE (rhs1) == SSA_NAME
+ && TREE_CODE (gimple_assign_rhs2 (stmt)) == INTEGER_CST
+ && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rhs1)
+ && default_vn_walk_kind != VN_NOWALK
+ && CHAR_BIT == 8
+ && BITS_PER_UNIT == 8
+ && BYTES_BIG_ENDIAN == WORDS_BIG_ENDIAN
+ && !integer_all_onesp (gimple_assign_rhs2 (stmt))
+ && !integer_zerop (gimple_assign_rhs2 (stmt)))
+ {
+ gassign *ass = dyn_cast <gassign *> (SSA_NAME_DEF_STMT (rhs1));
+ if (ass
+ && !gimple_has_volatile_ops (ass)
+ && vn_get_stmt_kind (ass) == VN_REFERENCE)
+ {
+ bool changed
+ = visit_reference_op_load (lhs, gimple_assign_rhs1 (ass),
+ ass, gimple_assign_rhs2 (stmt));
+ if (SSA_VAL (lhs) == lhs)
+ vn_nary_op_insert_stmt (stmt, lhs);
+ return changed;
+ }
+ }
+ break;
+ default:
+ break;
}
bool changed = set_ssa_val_to (lhs, lhs);
@@ -4751,18 +4842,22 @@ visit_reference_op_call (tree lhs, gcall
}
/* Visit a load from a reference operator RHS, part of STMT, value number it,
- and return true if the value number of the LHS has changed as a result. */
+ and return true if the value number of the LHS has changed as a result.
+ MASK is either NULL_TREE, or can be an INTEGER_CST if the result of the
+ load is bitwise anded with MASK and so we are only interested in a subset
+ of the bits and can ignore if the other bits are uninitialized or
+ not initialized with constants. */
static bool
-visit_reference_op_load (tree lhs, tree op, gimple *stmt)
+visit_reference_op_load (tree lhs, tree op, gimple *stmt, tree mask)
{
bool changed = false;
tree last_vuse;
tree result;
last_vuse = gimple_vuse (stmt);
- result = vn_reference_lookup (op, gimple_vuse (stmt),
- default_vn_walk_kind, NULL, true, &last_vuse);
+ result = vn_reference_lookup (op, gimple_vuse (stmt), default_vn_walk_kind,
+ NULL, true, &last_vuse, mask);
/* We handle type-punning through unions by value-numbering based
on offset and size of the access. Be prepared to handle a
@@ -4788,7 +4883,8 @@ visit_reference_op_load (tree lhs, tree
else
{
changed = set_ssa_val_to (lhs, lhs);
- vn_reference_insert (op, lhs, last_vuse, NULL_TREE);
+ if (mask == NULL_TREE)
+ vn_reference_insert (op, lhs, last_vuse, NULL_TREE);
}
return changed;
@@ -5175,14 +5271,15 @@ visit_stmt (gimple *stmt, bool backedges
switch (vn_get_stmt_kind (ass))
{
case VN_NARY:
- changed = visit_nary_op (lhs, ass);
- break;
+ changed = visit_nary_op (lhs, ass);
+ break;
case VN_REFERENCE:
- changed = visit_reference_op_load (lhs, rhs1, ass);
- break;
+ changed = visit_reference_op_load (lhs, rhs1, ass,
+ NULL_TREE);
+ break;
default:
- changed = defs_to_varying (ass);
- break;
+ changed = defs_to_varying (ass);
+ break;
}
}
}
--- gcc/testsuite/gcc.dg/tree-ssa/pr93582-10.c.jj 2020-02-28
12:01:42.680404857 +0100
+++ gcc/testsuite/gcc.dg/tree-ssa/pr93582-10.c 2020-02-28 12:01:42.679404872
+0100
@@ -0,0 +1,29 @@
+/* PR tree-optimization/93582 */
+/* { dg-do compile { target int32 } } */
+/* { dg-options "-O2 -fdump-tree-fre1" } */
+/* { dg-final { scan-tree-dump "return 72876566;" "fre1" { target le } } } */
+/* { dg-final { scan-tree-dump "return 559957376;" "fre1" { target be } } } */
+
+union U {
+ struct S { int a : 12, b : 5, c : 10, d : 5; } s;
+ unsigned int i;
+};
+struct A { char a[12]; union U u; };
+void bar (struct A *);
+
+unsigned
+foo (void)
+{
+ struct A a;
+ bar (&a);
+ a.u.s.a = 1590;
+ a.u.s.c = -404;
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#define M 0x67e0a5f
+#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+#define M 0xa5f067e0
+#else
+#define M 0
+#endif
+ return a.u.i & M;
+}
--- gcc/testsuite/gcc.dg/pr93582.c.jj 2020-02-28 12:01:42.679404872 +0100
+++ gcc/testsuite/gcc.dg/pr93582.c 2020-02-28 12:01:42.679404872 +0100
@@ -0,0 +1,57 @@
+/* PR tree-optimization/93582 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -Warray-bounds" } */
+
+struct S {
+ unsigned int s1:1;
+ unsigned int s2:1;
+ unsigned int s3:1;
+ unsigned int s4:1;
+ unsigned int s5:4;
+ unsigned char s6;
+ unsigned short s7;
+ unsigned short s8;
+};
+struct T {
+ int t1;
+ int t2;
+};
+
+static inline int
+bar (struct S *x)
+{
+ if (x->s4)
+ return ((struct T *)(x + 1))->t1 + ((struct T *)(x + 1))->t2; /* {
dg-bogus "array subscript 1 is outside array bounds of" } */
+ else
+ return 0;
+}
+
+int
+foo (int x, int y)
+{
+ struct S s; /* {
dg-bogus "while referencing" } */
+ s.s6 = x;
+ s.s7 = y & 0x1FFF;
+ s.s4 = 0;
+ return bar (&s);
+}
+
+static inline int
+qux (struct S *x)
+{
+ int s4 = x->s4;
+ if (s4)
+ return ((struct T *)(x + 1))->t1 + ((struct T *)(x + 1))->t2;
+ else
+ return 0;
+}
+
+int
+baz (int x, int y)
+{
+ struct S s;
+ s.s6 = x;
+ s.s7 = y & 0x1FFF;
+ s.s4 = 0;
+ return qux (&s);
+}
--- gcc/testsuite/gcc.c-torture/execute/pr93582.c.jj 2020-02-28
12:27:51.280925113 +0100
+++ gcc/testsuite/gcc.c-torture/execute/pr93582.c 2020-02-28
12:26:17.272332573 +0100
@@ -0,0 +1,22 @@
+/* PR tree-optimization/93582 */
+
+short a;
+int b, c;
+
+__attribute__((noipa)) void
+foo (void)
+{
+ b = c;
+ a &= 7;
+}
+
+int
+main ()
+{
+ c = 27;
+ a = 14;
+ foo ();
+ if (b != 27 || a != 6)
+ __builtin_abort ();
+ return 0;
+}
Jakub
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